Salomon lebensart



s. LEBENSART. A A A APPARATUS FOR ROLLING uP PAPER on THE LIKE.

APPLICATION FILED APR-J4. I915,

Q Q 4 Patented Hay 6,19l9;

UNITED STATES A NT OFFICE; j

To all whom it may concern:

Be it known that I, SALOMON Lnnnnsaur, an Austrian citizen, and resident of Charlotte-nburg, near Berlin, Germany, have invented certain new and useful Improvements in an Apparatus for Rolling Up Paperar the like, of which the following is a specification.

My invention relates to the propulsion and speed regulation of gathering rolls for aper and other material which are driyen by anelectric motor and it has for its, ObJBCt to provide electrical means for keeping .constant the energy supplied to said driving motor, in order to cause a constant pull to be exerted upon the paper or other material as it is wound upon'the roll notwithstanding the variation indiameter.

In the manufacture of paper and other sheet materiahs well as ofcord, wire, etc., gathering rolls are employed to receive the material after it has, been finished.- It will of course be readily understood that the ve locity ofrthe material must be maintained substantially constant and that in consequencethereof, the speed of the gathering roll must be decreased as its diameter is in creased during the gathering. Under the practice which has heretofore usually pre vailed friction clutches have been interposed between. the gathering roll and its shaft which permitted the speed of the roll to decrease by reason of the pull exerted upon it by the material as it is passed onto the roll. It is easy to conceive that the frictionalresistance of the clutches frequently caused the paper to be subjected to aconsiderable part of the pulling energy of the motor driving the roll, the paper being thentorn in many cases.

Another means for keeping thez velocity of the material constant consisted in an arm or the like resting on the periphery of the material wound upon the roll, the said arm being displaced in accordance with the increase of diameter of the roll and thereby operating a field'rheostat or other resistance inserted in the motor circu t 1n such a manner as to increase or decrease the resistance included in this circuit and thereby torvary the specdof the motor in accordance with y the variations of the diameter of the roll,

the velocity of the material being-thereby maintained constant. In practica use devices of this sort have proved to be cum bersome for the reason that the arm has to Specification 0: Letters I'atent.

be lifted whenever the roll is bein replaced; moreover this device does not ollow the variations in diameter of the roll with suiticient accuracy, it bein practically. impossible to adapt the variations in pull resistance to the rather small variations in diameter for a. given length of paper.

Patented May 6, 1919. Application flied April 14, 191-5. Serial No. 21,418. i i

According to my present lllVeIltlOHth energy of the driving motor of the Igatherin rollis kept constant and its speed is varied in accordance with the variation in diameter of the roll by means of a power relay inserted in the motor circuit.

The single figure of the accompanying drawing is a diagrammatic view of a system embodying my invention. 1 is a strip or line of paper or other material fed from the last roll 2 of a paper machine, over a plurality of rolls 3 for drying or 'other'purposes, onto a gathering roll 4. The papermachmeis drlven by an electric motorm and the gathering roll is driven by an electric motor m. Energy is supplied-to boththese motors by a generators connectedwith an='exciter 6, both rotating at lconstan pea A; hand switch a inserted in theinotorcircuit serves to cut'the gathering motonm in or out.

A power relay to is further inserted in this the-;eore.jc -of the relay being infi-uenced by a sptflj'ingf'adapted tobe adjusted by means of a screw #4 Gore 7c is connected to a double pole douhlethrow switch a) a serving to connect the excitcr e with a small auxiliary motor m serving to actuate the contact lever h of a resistance inserted in y the shunt n of the gathering motor m',

said shunt being also supplied with current bythe ex'citer' e. A- regulating resistance 9 adapted to be varied by hand is further insorted into the circuit of the motor m, said resistance serving for reducing the voltage of .the said gathering motor without however altering the speed of the paper anachine.

It is clear that by adjusting the relay 'w by means of screw t in accordance with the mechanical resistance of the paper or the like wound upon the roll, a certain predetermined pull may be exerted upon the paper or other material, the relay effecting an increase of the excitation of the gatheringmotor as soon as the current strength shows atendency to increase. This increase of excitation then causes the counter-electromotive force't'o' be raised to such an extent that the current strength remainsconstant in spite of-the fact that the motor is slowing down. Now, a motoroperating with constant current strength at a constant voltage will supply a constant energy which in turn will exert a constant pull u on the paper or other material as the pro not of the pull exerted on the paper and of its own velocity represents the energy received. In order to adjust the system as a. wholeto a redetermined uniform velocity oftravelan a predetermined uniform pull exerted on the paper, it is only necessary, before starting to wind up the paper, to adjust the relay to a predetermined current value, said value being dependent upon the specific mechanical resistance of the paper.

The novel system can be easily ada tedto various requirements of service. Pre erably the main driving motor of the paper machine is connected to a current source of adjustable voltage, the gathering roll driving motor being fed from the same source.

In case that the special kind of paper requires the paper machine to run at greater speed, according to my invention merely the voltage of the current source has to be increased. Thespeed of thegathering motor will 'then automatically increase. The power relay inserted in the armature circuit of the gathering motor will regulate the consumption of current so asto make the pull exerted uponthe paper constant.

It is easyto adapt the novel system to.

existing plants, especiallyso in view of the fact that the driving motors of paper machines are generally fed from a current source of variable voltage, the Ward Leonard.system-being' frequently used for this pu Ifdurmgservice the operator A0 h 0l it necessary to increase the voltage, he

The relay serving to regulate the speed of the gathering motor may be made'to vary the shunt excitation of the terminal voltage, such as in shunt motors, or the rotor resistance, such as in induction motors or it may be used for shifting the brushes in the case of an alternating commutator. motor.

I claim 4 1. In combination with a paper machine, a winding roll, separate electric driving motors for said machine and for said roll, a current source of adjustable voltage for feeding both motors with energy and "a power relay inserted in the circuit of the roll drivingmotor. 2. In combination witha paper'machine, a winding roll, separate electric driving-motors for said machine and for said roll, a current source of adjustable voltage for feeding said-"motors with ener a power relay inserted in the circuit of t e roll driving'moto'r'and means for varying the voltage of said current source. e

3. combination with a paper machine, a winding roll, separate electric driving m0- .tors for said machine and said roll, 9. current source of adjustable voltage for feeding said motors with energy, a power relay inserted in the circuit of the roll driving motor and means motor.

my signature; V SALOMON LEBENSART..

:for varying the voltage of said roll v p In' testimony whereofiI have hereunto set 

